Walk-in bathtub



FIG. 1 is a front perspective view of the claimed bathtub;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear perspective view thereof.

The ornamental design for a walk-in bathtub, as shown and described.